8206121380 has 24 divisors (see below), whose sum is σ = 17515363320. Its totient is φ = 3228637440.

The previous prime is 8206121351. The next prime is 8206121381. The reversal of 8206121380 is 831216028.

It can be written as a sum of positive squares in 4 ways, for example, as 53114944 + 8153006436 = 7288^2 + 90294^2 .

It is not an unprimeable number, because it can be changed into a prime (8206121381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3361945 + ... + 3364384.

It is an arithmetic number, because the mean of its divisors is an integer number (729806805).

Almost surely, 2^8206121380 is an apocalyptic number.

It is an amenable number.

8206121380 is an abundant number, since it is smaller than the sum of its proper divisors (9309241940).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

8206121380 is a wasteful number, since it uses less digits than its factorization.

8206121380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6726399 (or 6726397 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 8206121380 is about 90587.6447425365. The cubic root of 8206121380 is about 2017.0313367657.

The spelling of 8206121380 in words is "eight billion, two hundred six million, one hundred twenty-one thousand, three hundred eighty".